Not just doors. Many walls are thinner than that. Any window or glass wall, even reinforced bulletproof ones, immediately become an entrance and exit. You could presumably walk into Fort Knox, grab a few bars of gold and walk back out. If you’re arrested, no jail could hold you.
You could easily be the most famous magician alive, doing impossible escapes from sealed boxes, or disappearing by teleporting 7 inches into a hollow but completely sealed object.